Business Finance · Financial instruments issued or used by companies

Convertible Bonds, Warrants and Hybrid Instruments Explained

Updated 11 October 2026 · Fact-checked

A convertible bond is a loan that the holder can exchange for shares on set terms. A warrant is an option to buy new shares at a fixed price. Both mix debt and equity features. To solve questions, find the conversion value, compare it with the straight-debt value, and judge dilution and cost.

Understand Convertible Bonds, Warrants and Hybrid Instruments

A hybrid instrument has features of both debt and equity. The two you must know are the convertible bond and the warrant. In India, convertible loan stock is often called a convertible debenture.

A convertible bond pays a fixed coupon and is repaid at maturity, like a normal bond. But the holder may instead convert it into a set number of ordinary shares on set dates. The conversion ratio is the number of shares received per bond. The conversion price is the nominal value divided by the conversion ratio. If the holder does not convert, the company redeems the bond in cash.

A warrant gives the holder the right, not the obligation, to buy new shares at a fixed exercise price before an expiry date. A warrant is not a loan. It is often attached to a bond (a bond with warrants), and it can usually be detached and traded separately. When it is exercised, the company receives cash and issues new shares.

Why do companies issue them? The coupon is lower than on a straight bond, because investors pay for the chance of share gains. Cash costs are lower in the early years. The company may also issue shares later at a price above today's price. Investors get downside protection from the bond plus upside from the shares. The risks for the company are dilution of existing shareholders, and a cash repayment if the share price never rises enough.

To value a convertible, think of two parts. The first is a straight bond value: the present value of coupons and redemption at a yield for similar non-convertible debt. The second is the value of the conversion option. The market price is normally at least the higher of the straight-debt value and the conversion value. The excess over these is the conversion premium.

Key rules to remember

Conversion ratio: Conversion ratio = Nominal value of bond ÷ Conversion price; Number of ordinary shares received per bond on conversion.
Conversion value: Conversion value = Conversion ratio × Current share price; Use the expected share price at the conversion date for forward-looking questions.
Straight-debt (floor) value: Floor value = Σ coupon ÷ (1 + r)^t + Redemption ÷ (1 + r)^n; r is the yield on similar non-convertible debt. Market price is normally at least this, apart from credit effects.
Conversion premium: Premium = Market price of bond − Conversion value; Can also be shown as a percentage of conversion value. A positive premium is usual.
Warrant intrinsic value: Intrinsic value = max(Share price − Exercise price, 0); Per share. The market price of a warrant also includes time value, so it is higher than intrinsic value before expiry.
Holder's decision at conversion date: Convert if Conversion value > Redemption value; Otherwise take the cash redemption. Compare on the same date.

How to solve Convertible Bonds, Warrants and Hybrid Instruments questions

Use this order for most convertible and warrant questions. It keeps you from mixing debt and equity values.

1Identify the instrument and read its terms: coupon, redemption value, conversion ratio or price, exercise price, dates.
2Work out the conversion ratio if only the conversion price is given.
3Compute the conversion value at the share price and date asked.
4Compute the straight-debt value by discounting coupons and redemption at the non-convertible yield, if valuation is asked.
5Compare conversion value with redemption value or floor value to decide what the holder does, and find the premium if asked.
6If cost or dilution is asked, count new shares issued and any cash received or saved, and state the effect on existing shareholders.
7State your assumptions, such as the share price path, tax and no early conversion, and give the answer with units.

Quickest way: Floor, conversion, compare

When to use it: Use in multiple-choice questions and short numerical parts where you have little time.

Write the conversion ratio first: nominal ÷ conversion price.
Multiply by the share price to get conversion value.
Put the redemption value or floor value beside it.
The larger figure shows the holder's choice or the likely minimum market value.
For a warrant, use max(S − K, 0) per share and multiply by the number of shares per warrant.

Common mistakes in Convertible Bonds, Warrants and Hybrid Instruments

Using the market price of the bond instead of the nominal value to find the conversion ratio.
Students see a bond price in the question and assume it sets the ratio.
Fix: The ratio is nominal value ÷ conversion price. The market price is only used for the premium.
Treating a warrant as if it were a loan that must be repaid.
Warrants are often attached to bonds, so the two get merged.
Fix: A warrant is only an option on shares. The company receives cash when it is exercised and never repays it.
Discounting the straight-debt value at the convertible's own low coupon rate.
The coupon is the most visible rate in the question.
Fix: Discount at the yield on similar non-convertible debt. That is higher than the convertible's coupon because the conversion right has value.
Saying conversion always helps the company with no cost.
Students focus on the low coupon and on avoiding cash redemption.
Fix: Mention dilution of earnings and control, and that the company may issue shares at a price below the later market price.
Forgetting that warrant exercise brings in cash while conversion does not.
Both create new shares, so they are treated alike.
Fix: On conversion the debt is cancelled and no new cash arrives. On exercise the holder pays the exercise price and the debt, if any, stays.
Comparing conversion value today with a redemption value due years later.
Dates are ignored.
Fix: Compare on the same date, or discount the later amount to today.

Worked examples

Example 1

A company has convertible bonds of nominal value ₹1,000 each, convertible into ordinary shares at a conversion price of ₹250 per share. They are redeemable at par in 3 years. The share price at the conversion date is ₹290. Should the holder convert, and what is the gain per bond from converting rather than taking redemption?

Show the solution

Conversion ratio = 1,000 ÷ 250 = 4 shares per bond.
Conversion value = 4 × 290 = ₹1,160.
Redemption value = ₹1,000.
Since 1,160 > 1,000, converting is better.
Gain = 1,160 − 1,000 = ₹160 per bond.

Answer: The holder should convert. Each bond gives 4 shares worth ₹1,160, which is ₹160 more than redemption.

Example 2

A 2-year convertible bond has nominal value ₹100, pays an annual coupon of 5% and is redeemable at par. Similar non-convertible bonds yield 8% a year. Find the straight-debt value, and the conversion premium if the bond trades at ₹98 and its conversion value is ₹90. Ignore tax.

Show the solution

Coupon = 5% × 100 = ₹5 each year.
Discount factors at 8%: year 1 = 1 ÷ 1.08 = 0.92593; year 2 = 1 ÷ 1.08² = 1 ÷ 1.1664 = 0.85734.
PV of coupons = 5 × 0.92593 + 5 × 0.85734 = 4.6296 + 4.2867 = 8.9163.
PV of redemption = 100 × 0.85734 = 85.734.
Straight-debt value = 8.9163 + 85.734 = 94.65 (to 2 decimal places).
Conversion premium = 98 − 90 = ₹8, which is 8 ÷ 90 = 8.9% of conversion value.

Answer: Straight-debt value is about ₹94.65. The conversion premium is ₹8 per bond, about 8.9% of conversion value. The market price of ₹98 is above both the floor value and the conversion value.

Exam tips

In written answers, split the instrument into a bond part and an option part. Markers reward this structure.
Always give both sides: why the company issues it, and why the investor buys it. Add the risks for each side.
Show the conversion ratio and the share price used. Many marks go for clear method even if the arithmetic slips.
Distinguish convertibles from warrants in one sentence: conversion swaps debt for shares, exercise buys shares for cash.
In MCQs, check whether the question asks for per-bond or per-share values, and which date applies.

Practice questions from Financial instruments issued or used by companies

Convertible Bonds, Warrants and Hybrid Instruments in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Convertible Bonds, Warrants and Hybrid Instruments: frequently asked questions

What is the difference between warrants and convertible bonds?

A convertible bond is a loan that can be swapped for shares, so conversion cancels the debt. A warrant is only an option to buy shares at a set price, and the holder pays cash when exercising it. A warrant can be issued alone or attached to a bond.

Why do companies issue convertible loan stock?

It carries a lower coupon than ordinary debt, because investors value the right to convert. It may also let the company issue shares later at a higher price and avoid cash redemption. The cost is possible dilution of existing shareholders.

How do I value a convertible bond at a basic level?

Find the straight-debt value by discounting coupons and redemption at the yield on similar non-convertible debt. Then find the conversion value as the conversion ratio times the share price. The market price is normally at least the higher of the two, and the excess is the premium.

Is a hybrid instrument always a mix of debt and equity?

Yes, in the sense that it has features of both, such as a fixed coupon plus a share-linked right. Preference shares and convertibles are common examples. Check the terms, because the mix of features differs between instruments.